code: def test_richclub3():
      # tests edgecase
      G = nx.karate_club_graph()
      rc = nx.rich_club_coefficient(G, normalized=False)
      assert rc == {
          0: 156.0 / 1122,
          1: 154.0 / 1056,
          2: 110.0 / 462,
          3: 78.0 / 240,
          4: 44.0 / 90,
          5: 22.0 / 42,
          6: 10.0 / 20,
          7: 10.0 / 20,
          8: 10.0 / 20,
          9: 6.0 / 12,
          10: 2.0 / 6,
          11: 2.0 / 6,
          12: 0.0,
          13: 0.0,
          14: 0.0,
          15: 0.0,
      }
  
file_path: networkx/networkx/algorithms/tests/test_richclub.py
imports: import pytest
  import networkx
label_desc: Use image node_id 5 for calling a global function with example usage: test_richclub3() without return types